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ACQUISITIONS - Extant Aerospace (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Business Acquisition [Line Items] |  |  |
Acquisition of businesses, net of cash acquired | $ 2,347 | $ 762 | $ 437
Extant Aerospace [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition of businesses, net of cash acquired | 86 | 24 |
Amount of goodwill expected to be tax deductible | 39 | 12 |
Business acquisition, intangible assets, expected tax deductible amount | $ 22 | $ 6 |
Goodwill and intangible assets, expected tax deductible amount, period of deduction |  | 15 years |
Goodwill and Intangible Assets, Deductible For Tax Purposes, Term | 15 years |  |

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